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Tham khảo tài liệu 'optical fiber communications and devicesan incorrectly part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 15 All-Optical Amplitude Multiplexing Through Fiber Parametric Interaction BetWeen Binary Signals Fig. 8. Scheme for a PA and b ASK-4 generation. o with k P S i represents the angular frequencies of the pump the signal and the idler and O0 2kc Ằo where X0 is the zero dispersion wavelength of the fiber . scheme of the theoretical principle of OAM-4P. Essentially this principle is equal to the PA but two new features are added to the signals involved. First as in OAM-4 the power of the probe signal is intentionally offset from zero. Thus the ER of the signal is no longer infinite in contrast to the ideal OOK signals and is given by S pS 0 pS 0 . 30 Second the pump is also modulated with binary information in an analogous way to that of the probe signal. The powers of the 0 and 1 bits transmitted by the pump at the fiber input are designated as Pp 0 and Pp 0 respectively. It is assumed that Pp 0 is considerably higher than P 1 0 . Once the pump is modulated it will provide two amplification factors gP or gP depending on whether the pump information is a 0 or 1 bit. Consequently each of the binary levels of the signal at OS will have a lower or a higher gain splitting into two new power levels at the fiber output. For example consider that the signal at OS has the 1 bit power level then the pump modulation will split it in two power levels 01 and 11 depending on whether the pump information is a bit 0 or 1 respectively. This argument is also valid when the probe 16 Optical Fiber Communications and Devices signal transports a bit 0 power level. In such case the probe signal will either assume a 00 or 10 power level at the fiber output depending again on whether the pump information is a bit 0 or 1 respectively. Therefore the power levels of the signal envelope at as and at z L will be D00 0 D0 Cị 0-1 Pout - GPPS 0 31a P01 - G0 Irrn mb P out - GPPS 0 31b P10. g1 P 0t 31 A P out - GPPS 0 31c 11 1 1 P out - GPPS 0 31d where Pỏỉít represents the power of the signal at as .
